Method of mounting terminals to substrate

ABSTRACT

Disclosed is a cover for use in automatically mounting electric connectors to a printed-circuit board with the aid of a vacuum-suction nozzle. The cover comprises a top plate to which the vacuum-suction nozzle can be applied, and opposite hooks integrally connected to the opposite ends of the top plate which catch the opposite side walls of the connector housing. The fitting cover may be easily attached to an electric connector having pin-like terminals projecting from its upper surface to cover the pin-like terminals of the electric connector. The attaching of the fitting cover to the electric connector will provide a smooth, flat surface to the connector-and-cover combination, thereby facilitating the use of the vacuum suction nozzle to hold electrical connectors regardless of the contour of their upper surface.

This is a divisional of copending application(s) Ser. No. 07/982,210,now U.S. Pat. No. 5,297,609, issued Jan. 11, 1994.

FIELD OF THE INVENTION

The present invention relates to a cover for use in automaticallymounting electric connectors to the surface of a printed-circuit boardwith the aid of a vacuum-suction nozzle and more particularly, to acover for securing to an electric connector comprising a housing andpin-like terminals projecting from the upper surface of the housing.

BACKGROUND OF THE INVENTION

As is well known, a soldering reflow vessel is often used inautomatically mounting electric connectors to printed-circuit boards.Specifically, an electric connector is secured by a vacuum-suctionnozzle, and the electric connector is adjusted in position and broughtto a selected position in a printed-circuit board by the vacuum-suctionnozzle. The electric connector is then released from the vacuum-suctionnozzle by stopping application of negative pressure thereto. Then, gasis released inside the soldering reflow vessel, or infrared rays areradiated therein until the solder applied to selected conductors in theprinted-circuit board has been melted, thereby soldering the soldertails of the electric connector to the selected conductors in theprinted-circuit board.

As for the electric connector, if it has a flat top surface, such topsurface is convenient for securement by a vacuum-suction nozzle asdescribed above. Many electric connectors, however, have pin-liketerminals projecting from their top surface, thus preventing the directuse of vacuum-suction nozzles.

SUMMARY OF THE INVENTION

One object of the present invention is to provide a cover for use inautomatically mounting electric connectors to the surface of aprinted-circuit board with the aid of a vacuum-suction nozzle regardlessof the configuration of the top surface of the electric connectors.

To attain this object, a fitting cover according to the presentinvention comprises a top plate to which the end of a vacuum-suctionnozzle can be applied, and opposite hooks integrally connected to theopposite ends of said top plate. These hooks catch the opposite sidewalls of the connector housing. The attaching of the fitting cover tothe electric connector provides a smooth, flat surface to the electricconnector convenient to the suctioning-and-holding of the electricconnector by a vacuum-suction nozzle, regardless of irregular contourson the top surface of the electric connector. Thus, existingvacuum-suction nozzles can be used to hold different electric connectorswithout modification.

According to one aspect of the present invention, a fitting cover mayhave hooks with an engagement projection integrally connected thereto tofit in the engagement recess of each of the opposite side walls of theconnector housing. This arrangement facilitates the reliable holding andrelease of electric connectors from their associated covers.

According to another aspect of the present invention, the rear side ofthe top plate of the fitting cover is designed to be brought in contactwith the tips of the pin-like terminal of the electric connector whenthe engagement projection of each hook of the cover fits in theengagement recess of each of the opposite side walls of the connectorhousing. The pin-like terminals of equal height are pushed against thelower side of the top plate of the fitting cover, thereby permitting theelectric connector to be held in horizontal position, perpendicular tothe longitudinal axis of the vacuum suction nozzle. This facilitatescontrolling the position of the electric connector handled by the vacuumsuction nozzle. The pressure caused by the vacuum suction nozzle isdistributed equally to all pin-like terminals, and therefore, there isno fear of deformation of selected pin-like terminals, which may becaused in case of pin-like terminals of unequal heights.

According to still another aspect of the present invention, the width 1of the top plate of the dover is selected to be smaller than thetip-to-tip lateral distance L of opposite solder tails of the electricconnector. This arrangement permits the complete exposure of all soldertails of the electric connector to infrared rays for soldering withoutbeing concealed behind the fitted cover.

Other objects and advantages of the present invention will be apparentfrom the following description of a fitting cover according to apreferred embodiment of the present invention, which is shown inaccompanying drawings:

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of an electric connector and fitting coveraccording to the present invention prior to attaching of the fittingcover to the electric connector;

FIG. 2 a front view of the integral combination of the electricconnector and the fitting cover;

FIG. 3 is a side view, partly in section, of the integral combination ofthe electric connector and the fitting cover;

FIG. 4 is an enlarged view, showing how the fitting cover is engagedwith the electric connector;

FIG. 5 is a perspective view of the integral combination of the electricconnector and the fitting cover;

FIG. 6 shows the madder in which a vacuum-suction nozzle is initiallysuctioning and holding an electric connector while in packing utilizedfor shipping of the connector;

FIG. 7 shows the manner in which the electric connector having anassociated fitting cover attached thereto is aligned in lateral positionby a pair of opposite positioning arms; and

FIG. 8 shows the manner in which the electric connector and fittingcover combination is aligned in longitudinal position by another pair ofopposite positioning arms.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

As seen from drawings and in particular FIG. 1, an electric connector 4comprises a housing 1 and pin-like terminals 3 project from the uppersurface 2 of the housing 1. The electric connector 4 is to be mounted toa printed-circuit board (not shown) with the aid of a vacuum-suctionnozzle 5. A cover 6 is used in automatically mounting such electricconnector 4 to the printed-circuit board. The cover comprises a topplate 7, to which the end 16 of a vacuum-suction nozzle 5 can beapplied, and opposite arms 9 integrally connected to the opposite endsof the top plate 7 which latch the opposite side walls 8 of theconnector housing 1. Each arm 9 has an engagement projection or hook 11to fit in the engagement recess 10 of each side wall 8 of the connectorhousing 1 in order to latch the cover 6 to connector 4.

As best seen from FIG. 2, the underside 13 of the top plate 7 of thefitting cover 6 is designed to be brought into contact with the tips 14of the pin-like terminals 3 of the electric connector 4 when the cover 6is positioned on connector 4 and engagement projection 11 fits in theengagement recess 10 of each of the opposite side walls 8 of theconnector housing 1.

As best seen from FIG. 3, the width or lateral dimension 1 of theceiling plate 7 of the cover 6 is selected to be smaller than thetip-to-tip lateral distance L of opposite solder tails 12 of theelectric connector 4.

In use, the cover 6 is fitted on the electric connector 4 with theunderside of the cover 6 pushed against the pin-like projections 14 ofthe electric connector 4 and with the opposite hooks 9 of the cover 6caught by the recesses 10 of the opposite sides of the electricconnector 4. A printed-circuit board on which the electric connector isto be placed will be parallel to the top surface of the cover 6, whichis fitted on the electric connector 4 as just described. As describedearlier, the width or lateral dimension 1 of the top plate of the coveris smaller than the tip-to-tip lateral distance L of opposite soldertails 12 of the electric connector 4.

An integral combination of electric connector and cover is attracted tothe vacuum suction nozzle 5 by applying negative pressure to the cover6. Specifically, the end 16 of the vacuum nozzle 5 is put in contactwith the top plate 7 of the cover 6 and negative pressure is applied tothe ceiling plate 7 of the cover 6, thereby causing the connector andcover combination to be held by the vacuum suction nozzle 5. Then, asseen from FIGS. 7 and 8, the connector-and-cover combination is adjustedin position to reduce lateral and longitudinal deviations, if any,relative to the center of the connector 4 with the aid of two pairs ofpositioning arms 15.

The connector and cover combination is brought to a selected position onthe printed-circuit board where the electric connector 4 is placed.Then, application of negative pressure to the top 7 of the cover 6 isstopped, thereby releasing the connector.

The printed-circuit board having the electric connector 4 placed thereonis brought to a reflow vessel in which, for instance, infrared rays areradiated to melt the solder applied to selected conductors of theprinted-circuit board. Gas may be used in place of infrared rays forsoldering in the reflow vessel. Thus, the solder tails 12 of theelectric connector 4 are soldered to the selected conductors of theprinted-circuit board. After attaching the electric connector 4 to theprinted circuit board, the cover 6 is removed from the electricconnector 4.

As may be understood from the above, a fitting cover may be easilyattached to an electric connector having pin-like terminals projectingfrom its upper surface with its opposite hooks caught in the recesses ofthe opposite sides of the electric connector, thus covering the pin-liketerminals of the electric connector. The attaching of the fitting coverto the electric connector will provide a smooth, flat surface to theconnector and cover combination, thereby facilitating the use of avacuum-suction nozzle to hold the electrical connector regardless of anirregular contour on the top surface of the electrical connector.

It will be understood that the invention may be embodied in otherspecific forms without departing from the spirit or centralcharacteristics thereof. The present examples and embodiments,therefore, are to be considered in all respects as illustrative and notrestrictive, and the invention is not to be limited to the details givenherein.

I claim:
 1. A method of positioning an electrical connector assembly ona mounting surface of an electrical apparatus through the engagement ofa vacuum-suction nozzle including the steps of providing an electricalconnector assembly including an insulative housing with a first surfaceadapted to be positioned PG,11 adjacent said mounting surface, a secondsurface opposite said first surface and a pair of opposed sidewallsgenerally perpendicular to said first surface, said housing furtherincluding a plurality of conductive terminals mounted therein, eachterminal having a tail portion for interconnection to circuitry of theelectrical apparatus;said method including the steps of:providing acover on said housing to overlie a central region thereof, said coverhaving a generally planar, smooth top surface for engagement by thevacuum-suction nozzle; engaging said smooth top surface of said coverwith the vacuum-suction nozzle; positioning said electrical connectorassembly on said mounting surface; soldering said tail portions of saidterminals to said electrical apparatus; and removing said cover fromsaid assembly.
 2. The method of claim 1 further including the step ofaligning said connector assembly on said vacuum-suction nozzle byengaging said connector assembly with alignment means prior to saidpositioning step.
 3. The method of claim 2 wherein said aligning stepincludes engaging said connector assembly on first opposite sides of theassembly and then engaging said connector assembly on second oppositesides of the assembly.
 4. The method of claim 1 wherein said removingstep includes pulling said cover vertically away from said mountingsurface.
 5. A method of positioning an electrical connector assembly ona mounting surface of an electrical apparatus through the engagement ofa vacuum-suction nozzle including the steps of providing an electricalconnector assembly including an insulative housing with a first surfaceadapted to be positioned adjacent said mounting surface, a secondsurface opposite said first surface and a pair of opposed sidewallsgenerally perpendicular to said first surface, said housing furtherincluding a plurality of conductive terminals mounted therein, eachterminal having a tail portion for interconnection to circuitry of theelectrical apparatus;said method including the steps of:providing acover on said housing to overlie a central region thereof, said coverhaving a generally planar, smooth top surface for engagement by thevacuum-suction nozzle; engaging said smooth top surface of said coverwith the vacuum-suction nozzle; positioning said electrical connectorassembly on said mounting surface; soldering said tail portions of saidterminals to said electrical apparatus; and removing said cover fromsaid assembly.
 6. The method of claim 5 further including the step ofaligning said connector assembly on said vacuum-suction nozzle byengaging said connector assembly with alignment means prior to saidpositioning step.
 7. The method of claim 6 wherein said aligning stepincludes engaging said connector assembly on first opposite sides of theassembly and then engaging said connector assembly on second oppositesides of the assembly.
 8. The method of claim 5 wherein said removingstep includes pulling said cover vertically away from said mountingsurface.
 9. A method of assembling an electrical connector to electricalcircuitry on a mounting surface of an electrical apparatus, theelectrical connector having an upper surface, a lower surface to bepositioned adjacent the mounting surface, a pair of outwardly facingsidewalls, and a plurality of conductive terminals having tail portionsadjacent the lower surface for interconnection to the electricalcircuitry on the mounting surface, said method including the stepsof:releasably attaching a cover having a generally planar, smooth topsurface to the connector, said releasably attaching step includinggrasping the pair of outwardly facing sidewalls of the connector with aspaced apart pair of flexible cantilevered arms depending downwardlyfrom opposed ends of the cover; engaging the smooth top surface of thecover with a suction nozzle; moving the suction nozzle in order toposition the connector on the mounting surface with the conductiveterminals in alignment with the electrical circuitry on the mountingsurface; soldering the conductive terminals to the electrical circuitry;and removing the cover from the electrical connector.
 10. The method ofclaim 9 further including the step of aligning said connector assemblyon said vacuum-suction nozzle by engaging said connector assembly withalignment means prior to said positioning step.
 11. The method of claim10 wherein said aligning step includes engaging said connector assemblyon first opposite sides of the assembly and then engaging said connectorassembly on second opposite sides of the assembly.
 12. The method ofclaim 9 wherein said removing step includes pulling said coververtically away from said mounting surface.